I've experienced 30-35 degrees at 70%-90% humidity while cycling. It's totally unlike 45 in a dry climate. The former makes you feel like the activity ceiling

I've experienced 30-35 degrees at 70%-90% humidity while cycling. It's totally unlike 45 in a dry climate. The former makes you feel like the activity ceiling is much lower, and cooling down through natural means is much slower. Sweating just doesn't work that well. That was at a wet bulb temperature of ~28 degrees.